6. Sulaiman telah mengumpulkan pandangan responden dari tiga buah kilang kayu A, B dan C mengenai tahap ketahanan perabot yang dibuat menggunakan papan lapis daripada tandan kelapa sawit. Sembilan jenis perabot telah dikemukakan kepada setiap kilang dan tahap ketahanan diukur dalam ukuran nilai 1 - 10. Data yang diperolehi adalah seperti berikut: Sulaiman had collected the respondent's opinion from three wood factories, A, B and C on the durability of the furniture manufactured from oil palm fruit bunch particle board. Nine types of fumiture were forwarded for their opinion. Data are as follows: Kilang Tahap Kilang Tahap Kilang Tahap Factory Level Factory Level Factory Level B 9 C COCOCCA 10 10 9 9 B 10 BABC < < < 10 9 10 10 A 10 A 9 10 B 9 10 B 10 9 C 10 ABBA ACABA 10 10 2 10 9 9 10 9 10 9 Analisis mendapati taburan data tidak normal. Dengan menggunakan aras keyakinan 99%, adakah terdapat bukti yang mencukupi bahawa tiada beza ketara antara ketiga-tiga kilang ini? Analysis showed that the data are not normally distributed. Using confidence level of 99%, is there enough evidence to say that there is no significant different between factories? (15 Markah/ 15 Marks)